* {
  margin: 0;
  padding: 0;
}

html, body, .main {
  height: 100vh;
  width: 100vw;
}

.main {
  background-color: #efefef;
}

iframe {
  width: 375px;
  height: 667px;
  border: none;
  background: #fff;
  position: absolute;
  right: 0;
  top: 0;
}